Gas turbine and the like



- Nov. 14, 1944. D. D. STREID GAS TURBINE AND THE LIKE Filed March 28, 1942 Inventor; [Dale D. Streid, by vzw zm His Attovney.

' UNITED STATES ,PATEN T" OFFICE GAS 'runnma'ssn 'rmi use Dalen. Streid, West Lynn. Mara,

assignor to General Electric Company, a corporation oi- New York i l'ppllcation-M'arch za iasaserlnuo.430,306 1 l blaims. (cl. sis-1s) The present invention-relates togas turbines and the like. f.

The invention flnds ,espec lutility in connection with gas turbine drive superchargers for aircraft and it is this application of my invention I slip stream is circulated to cool the wheel. The

cooling cap is supported from the turbine nozzle box which is located on theside of the turbine wheel opposite the side on which the cooling cap is located. Thus the cooling cap which, by rea- Reierring to the drawing, I indicatesthe turbine wheel or an aircraft turbosuperchargen mounted on a shaft 2 carried in a bearing 3.

I Surrounding the bearing 3 in spaced relation d, however, that v son of the cooling air passing across or through it, is, during operation, maintained at a relative ly low temperature, a temperature of the order of 500 F.,-i'or example, is supported from a memher, the temperature of which may be 01' the order oi" 1300 F. This means that in use there is a considerable diilerence in the amounts of expansion of the cooling cap and its supportso-that the mounting of the cooling cap on ,the nozzle box so that at all times it-isflr'mly supported and so that, with the diilerence in expansion, undue stresses are not set up in any'oi' the parts-has been a serious problem.v And the problem has been augmented by the factthat it is necessarytokeep the weightat'aminimm.

The object of my invention is to provide an improved construction and arrangement for supcooling cap which is maintained relatively cool. on a second structure, such as a turbosupercharger nozzle: box,

s porting a structure, suchas'a turbosupercharger which becomes very. hot,

which is simple instructu're." light in weight, permitsoi diilerences in expansion taking place without placing any of the parts under undue stresses and at all times maintains the partsiirnily supported.

For'a consider ation or what I beneve'to' be.

novel and my invention, attention is directed to the following specification andthe claims appended thereto.

In the drawing, mg. 1 is .1. sectional view, or a portion or an'aircrai't turbosupercharger em-- bodying my invention: Fig. 2 is a face view'there- 0!; I'll. 3'is a detail ins fr me. and lie.

thereto and suitably supported from the super charger structure (by means not shown) is an annular nomlexbox 4 having a ring of nozzles I for directing actuating gases to the buckets In of.

the turbine wheel. Connected with the nozzle box is aninlet conduit 0- through which gases, for example, exhaust gases from an aircraft engine, are supplied to the nozzle box, and at i is the waste conduit in which-is located a waste gate valve 8 for regulating the supercharger.

Located in front of the turbine wheel is a cooling cap 9 which may be of anysuitable structure and which is provided with an admission conduit I. through which cooling air, for example, air from the aircraft slip stream, is supplied to the interior of the cooling cap and from which .it discharges through passages II and.

. The structure so far described is,a known one and is to be taken as typical of any suitable turbosupercharger structure. In operation, the .temperature of the nozzle box may reach avalue as high as 1300 1''. while that of the cooling cap may I be of the order oi 5001'. 7 According to the embodiment of my invention illustrated in the drawing. I provide an annular ring II which is Z-shaped in cross section t and which has one flange attached to the nozzlebox by suitable means such asby welding, as is indicated at It. I then attach the,cooling cap to the other flange ll of the. Z-ring at two diametricallyopposite points (which may ;be con,

sidered the top and bottom'oi'the cooling cap) bylas'tening means, one or both of which may comprise a yielding support of novel construction. In the present instance; I have shown a yielding sup ort at th'etop only or the cooling cap. the bottom of the cap being su ported by flanges ll attached to flange i1 bv bolts i9;

The attaching means or support for theup er end of the cooling cap comprises two bracket members alike in structure and each comprising an: upri ht or'bracket arm. a torsion cross bar which extends at right angles to and .an anchoring ear. In the drawing, the up-- right or bracket. arm, the torsion cross bar and the anchoring ear of one of are desi nated 20. II and I! and thecorrespondins-parts or the other bracket member 20', 2|

i and'fl'. The uprights or bracket arms--20 and Perspective view or a support-' 4 is a detail sectional view. 1

II are located on opposite sides of inlet conduit the bracket. arlm the'bracket members and areattachedthereto-by bolts II as shown particularly in Fig. 4, the wall of conduit l being reinforced by welded-in inserts 24 at the points .of attachment. The anchoring ears 22 and 22' bracket member at its end remote from the end.

fixed to the cooling cap is pivotally mounted on the end of the torsion ba of the other bracket member fixed to the Z-ring. To this end, torsion bar 21' is provided with an inturned flange 21' which is parallel to bracket arm 20' and which is pivotedon a stud 28' fixed to the bracket arm 20 (see Fig. 4). Similarly, the torsion bar 2| is provided with an inturned flange 21, which is pivoted on a stud 28, fixed to bracket arm 20'.

The anchoring ears 22 and 22' may be formed in any suitable manner and extend in any suitable direction, the essential thing being that they serve to anchor the ends of the torsion bars'to the Z-ring flange. In the present instance, ears 22 and 22' are shown as being separate pieces provided with flanges 29 and 29' suitably welded to flanges 21 and 21. Preferably ears 22 and 22' are arranged to extend outwardly as shown particularly in Figs. 3 and 4, as this provides for a greater span between the ears and gives full efiect to the total length of the torsion bars 2| and 2!. 7

With the above-described arrangement, the cooling'cap is firmly anchored to the nozzle box at both its lower and upper ends. When difierence inexpansion takes place between the nozzle box and the cooling cap, the bracket arms 20 and 20' pivot about studs 28 and 28, the torsion bars 2! and 2i twisting to permit the relative movement to take place. The torsion bars have ,sufiicient flexibility to permit the movement to take place without placing any of the parts under undue strain. At the same time, the torsion bars serve always to hold the parts against looseness or rattling. 'Ijhe arrangement is such preferably that when initially bolted together, the torsion bars are put under a slight strain or twist so that even when the parts are cold and in their normal By pivotally connecting the two torsion bars together at their ends as shown the torsion bars are held in definite relation to each other so that when relative movement occurs between the cooling cap and the nozzle box, movement of the torsion bars is confined to a twisting of the bars.

As stated above, if desired the parts may be attached to each other by more than a single flexible connection as shown but ordinarily I find a single connection sufficient.

In accordancewith the provisions of the patent statutes, I have described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof but I desire to have it understood that the apparatus shown is only illus-' trative and that the invention may be carried out by other means. i

What I claim as new and desire to secure by Letters Patent of the United States is:

1. The combination with two members subject to expansion relatively to each other, of flexible means connecting said members comprising transversely extending torsion bars each fixed at one end to one of said members and having at its other end an angularly extending bracket arm fixed to the other member, adjacent ends of said torsion bars in each instance being pivotally connected together.

2. The combination with two members subject to expansion relatively to each other, of flexible means connecting said members comprising two positions relatively to each other, they are firmly held together.

torsion bars arranged parallel to each other and pivotally connected together at each of their ends, and means connecting opposite ends of the torsion bars to said members.

3. The combination with two members subject I to expansion relatively to each other, of flexible means connecting said members comprising two torsion bars arranged parallel to each other and having at each end angularly extending parts pivotally connected together, and means includ ing angularly extending bracket arms for connecting opposite ends of the torsion bars to said members.

4. A flexible bracket for connectin together two members subject to relative movement comprising two parallel torsion bars having at each end angularly extending parts pivoted together. each torsion bar having an attaching car at one end and an angularly extending attaching bracket arm at the other end.

1 DALE D. STREID. 

